422 lines
13 KiB
Rust
422 lines
13 KiB
Rust
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// Bitcoin Hashes Library
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// Written in 2019 by
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// The rust-bitcoin developers
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// This module is largely copied from the rust-siphash sip.rs file;
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// while rust-siphash is licensed under Apache, that file specifically
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// was written entirely by Steven Roose, who is re-licensing its
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// contents here as CC0.
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//! SipHash 2-4 implementation.
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//!
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use core::{cmp, mem, ptr, str};
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use core::ops::Index;
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use core::slice::SliceIndex;
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use crate::{Error, Hash as _, HashEngine as _, hex};
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crate::internal_macros::hash_type! {
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64,
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false,
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"Output of the SipHash24 hash function.",
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"crate::util::json_hex_string::len_8"
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}
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#[cfg(not(fuzzing))]
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fn from_engine(e: HashEngine) -> Hash {
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Hash::from_u64(Hash::from_engine_to_u64(e))
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}
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#[cfg(fuzzing)]
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fn from_engine(e: HashEngine) -> Hash {
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let state = e.midstate();
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Hash::from_u64(state.v0 ^ state.v1 ^ state.v2 ^ state.v3)
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}
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macro_rules! compress {
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($state:expr) => {{
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compress!($state.v0, $state.v1, $state.v2, $state.v3)
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}};
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($v0:expr, $v1:expr, $v2:expr, $v3:expr) => {{
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$v0 = $v0.wrapping_add($v1);
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$v1 = $v1.rotate_left(13);
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$v1 ^= $v0;
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$v0 = $v0.rotate_left(32);
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$v2 = $v2.wrapping_add($v3);
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$v3 = $v3.rotate_left(16);
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$v3 ^= $v2;
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$v0 = $v0.wrapping_add($v3);
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$v3 = $v3.rotate_left(21);
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$v3 ^= $v0;
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$v2 = $v2.wrapping_add($v1);
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$v1 = $v1.rotate_left(17);
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$v1 ^= $v2;
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$v2 = $v2.rotate_left(32);
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}};
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}
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/// Load an integer of the desired type from a byte stream, in LE order. Uses
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/// `copy_nonoverlapping` to let the compiler generate the most efficient way
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/// to load it from a possibly unaligned address.
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///
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/// Unsafe because: unchecked indexing at `i..i+size_of(int_ty)`.
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macro_rules! load_int_le {
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($buf:expr, $i:expr, $int_ty:ident) => {{
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debug_assert!($i + mem::size_of::<$int_ty>() <= $buf.len());
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let mut data = 0 as $int_ty;
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ptr::copy_nonoverlapping(
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$buf.get_unchecked($i),
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&mut data as *mut _ as *mut u8,
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mem::size_of::<$int_ty>(),
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);
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data.to_le()
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}};
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}
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/// Internal state of the [`HashEngine`].
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#[derive(Debug, Clone)]
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pub struct State {
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// v0, v2 and v1, v3 show up in pairs in the algorithm,
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// and simd implementations of SipHash will use vectors
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// of v02 and v13. By placing them in this order in the struct,
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// the compiler can pick up on just a few simd optimizations by itself.
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v0: u64,
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v2: u64,
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v1: u64,
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v3: u64,
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}
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/// Engine to compute the SipHash24 hash function.
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#[derive(Debug, Clone)]
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pub struct HashEngine {
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k0: u64,
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k1: u64,
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length: usize, // how many bytes we've processed
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state: State, // hash State
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tail: u64, // unprocessed bytes le
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ntail: usize, // how many bytes in tail are valid
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}
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impl HashEngine {
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/// Creates a new SipHash24 engine with keys.
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pub fn with_keys(k0: u64, k1: u64) -> HashEngine {
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HashEngine {
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k0,
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k1,
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length: 0,
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state: State {
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v0: k0 ^ 0x736f6d6570736575,
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v1: k1 ^ 0x646f72616e646f6d,
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v2: k0 ^ 0x6c7967656e657261,
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v3: k1 ^ 0x7465646279746573,
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},
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tail: 0,
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ntail: 0,
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}
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}
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/// Creates a new SipHash24 engine.
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pub fn new() -> HashEngine {
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HashEngine::with_keys(0, 0)
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}
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/// Retrieves the keys of this engine.
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pub fn keys(&self) -> (u64, u64) {
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(self.k0, self.k1)
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}
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#[inline]
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fn c_rounds(state: &mut State) {
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compress!(state);
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compress!(state);
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}
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#[inline]
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fn d_rounds(state: &mut State) {
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compress!(state);
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compress!(state);
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compress!(state);
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compress!(state);
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}
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}
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impl Default for HashEngine {
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fn default() -> Self {
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HashEngine::new()
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}
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}
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impl crate::HashEngine for HashEngine {
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type MidState = State;
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fn midstate(&self) -> State {
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self.state.clone()
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}
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const BLOCK_SIZE: usize = 8;
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#[inline]
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fn input(&mut self, msg: &[u8]) {
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let length = msg.len();
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self.length += length;
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let mut needed = 0;
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if self.ntail != 0 {
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needed = 8 - self.ntail;
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self.tail |= unsafe { u8to64_le(msg, 0, cmp::min(length, needed)) } << (8 * self.ntail);
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if length < needed {
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self.ntail += length;
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return;
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} else {
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self.state.v3 ^= self.tail;
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HashEngine::c_rounds(&mut self.state);
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self.state.v0 ^= self.tail;
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self.ntail = 0;
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}
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}
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// Buffered tail is now flushed, process new input.
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let len = length - needed;
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let left = len & 0x7;
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let mut i = needed;
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while i < len - left {
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let mi = unsafe { load_int_le!(msg, i, u64) };
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self.state.v3 ^= mi;
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HashEngine::c_rounds(&mut self.state);
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self.state.v0 ^= mi;
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i += 8;
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}
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self.tail = unsafe { u8to64_le(msg, i, left) };
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self.ntail = left;
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}
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fn n_bytes_hashed(&self) -> usize {
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self.length
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}
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}
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impl Hash {
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/// Hashes the given data with an engine with the provided keys.
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pub fn hash_with_keys(k0: u64, k1: u64, data: &[u8]) -> Hash {
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let mut engine = HashEngine::with_keys(k0, k1);
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engine.input(data);
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Hash::from_engine(engine)
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}
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/// Hashes the given data directly to u64 with an engine with the provided keys.
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pub fn hash_to_u64_with_keys(k0: u64, k1: u64, data: &[u8]) -> u64 {
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let mut engine = HashEngine::with_keys(k0, k1);
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engine.input(data);
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Hash::from_engine_to_u64(engine)
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}
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/// Produces a hash as `u64` from the current state of a given engine.
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#[inline]
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pub fn from_engine_to_u64(e: HashEngine) -> u64 {
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let mut state = e.state;
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let b: u64 = ((e.length as u64 & 0xff) << 56) | e.tail;
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state.v3 ^= b;
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HashEngine::c_rounds(&mut state);
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state.v0 ^= b;
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state.v2 ^= 0xff;
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HashEngine::d_rounds(&mut state);
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state.v0 ^ state.v1 ^ state.v2 ^ state.v3
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}
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/// Returns the (little endian) 64-bit integer representation of the hash value.
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pub fn as_u64(&self) -> u64 {
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u64::from_le_bytes(self.0)
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}
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/// Creates a hash from its (little endian) 64-bit integer representation.
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pub fn from_u64(hash: u64) -> Hash {
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Hash(hash.to_le_bytes())
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}
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}
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/// Load an u64 using up to 7 bytes of a byte slice.
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///
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/// Unsafe because: unchecked indexing at `start..start+len`.
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#[inline]
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unsafe fn u8to64_le(buf: &[u8], start: usize, len: usize) -> u64 {
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debug_assert!(len < 8);
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let mut i = 0; // current byte index (from LSB) in the output u64
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let mut out = 0;
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if i + 3 < len {
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out = u64::from(load_int_le!(buf, start + i, u32));
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i += 4;
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}
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if i + 1 < len {
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out |= u64::from(load_int_le!(buf, start + i, u16)) << (i * 8);
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i += 2
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}
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if i < len {
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out |= u64::from(*buf.get_unchecked(start + i)) << (i * 8);
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i += 1;
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}
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debug_assert_eq!(i, len);
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out
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_siphash_2_4() {
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let vecs: [[u8; 8]; 64] = [
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[0x31, 0x0e, 0x0e, 0xdd, 0x47, 0xdb, 0x6f, 0x72],
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[0xfd, 0x67, 0xdc, 0x93, 0xc5, 0x39, 0xf8, 0x74],
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[0x5a, 0x4f, 0xa9, 0xd9, 0x09, 0x80, 0x6c, 0x0d],
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[0x2d, 0x7e, 0xfb, 0xd7, 0x96, 0x66, 0x67, 0x85],
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[0xb7, 0x87, 0x71, 0x27, 0xe0, 0x94, 0x27, 0xcf],
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[0x8d, 0xa6, 0x99, 0xcd, 0x64, 0x55, 0x76, 0x18],
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[0xce, 0xe3, 0xfe, 0x58, 0x6e, 0x46, 0xc9, 0xcb],
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[0x37, 0xd1, 0x01, 0x8b, 0xf5, 0x00, 0x02, 0xab],
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[0x62, 0x24, 0x93, 0x9a, 0x79, 0xf5, 0xf5, 0x93],
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[0xb0, 0xe4, 0xa9, 0x0b, 0xdf, 0x82, 0x00, 0x9e],
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[0xf3, 0xb9, 0xdd, 0x94, 0xc5, 0xbb, 0x5d, 0x7a],
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[0xa7, 0xad, 0x6b, 0x22, 0x46, 0x2f, 0xb3, 0xf4],
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[0xfb, 0xe5, 0x0e, 0x86, 0xbc, 0x8f, 0x1e, 0x75],
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[0x90, 0x3d, 0x84, 0xc0, 0x27, 0x56, 0xea, 0x14],
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[0xee, 0xf2, 0x7a, 0x8e, 0x90, 0xca, 0x23, 0xf7],
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[0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1],
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[0xdb, 0x9b, 0xc2, 0x57, 0x7f, 0xcc, 0x2a, 0x3f],
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[0x94, 0x47, 0xbe, 0x2c, 0xf5, 0xe9, 0x9a, 0x69],
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[0x9c, 0xd3, 0x8d, 0x96, 0xf0, 0xb3, 0xc1, 0x4b],
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[0xbd, 0x61, 0x79, 0xa7, 0x1d, 0xc9, 0x6d, 0xbb],
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[0x98, 0xee, 0xa2, 0x1a, 0xf2, 0x5c, 0xd6, 0xbe],
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[0xc7, 0x67, 0x3b, 0x2e, 0xb0, 0xcb, 0xf2, 0xd0],
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[0x88, 0x3e, 0xa3, 0xe3, 0x95, 0x67, 0x53, 0x93],
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[0xc8, 0xce, 0x5c, 0xcd, 0x8c, 0x03, 0x0c, 0xa8],
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[0x94, 0xaf, 0x49, 0xf6, 0xc6, 0x50, 0xad, 0xb8],
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[0xea, 0xb8, 0x85, 0x8a, 0xde, 0x92, 0xe1, 0xbc],
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[0xf3, 0x15, 0xbb, 0x5b, 0xb8, 0x35, 0xd8, 0x17],
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[0xad, 0xcf, 0x6b, 0x07, 0x63, 0x61, 0x2e, 0x2f],
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[0xa5, 0xc9, 0x1d, 0xa7, 0xac, 0xaa, 0x4d, 0xde],
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[0x71, 0x65, 0x95, 0x87, 0x66, 0x50, 0xa2, 0xa6],
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[0x28, 0xef, 0x49, 0x5c, 0x53, 0xa3, 0x87, 0xad],
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[0x42, 0xc3, 0x41, 0xd8, 0xfa, 0x92, 0xd8, 0x32],
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[0xce, 0x7c, 0xf2, 0x72, 0x2f, 0x51, 0x27, 0x71],
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[0xe3, 0x78, 0x59, 0xf9, 0x46, 0x23, 0xf3, 0xa7],
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[0x38, 0x12, 0x05, 0xbb, 0x1a, 0xb0, 0xe0, 0x12],
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[0xae, 0x97, 0xa1, 0x0f, 0xd4, 0x34, 0xe0, 0x15],
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[0xb4, 0xa3, 0x15, 0x08, 0xbe, 0xff, 0x4d, 0x31],
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[0x81, 0x39, 0x62, 0x29, 0xf0, 0x90, 0x79, 0x02],
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[0x4d, 0x0c, 0xf4, 0x9e, 0xe5, 0xd4, 0xdc, 0xca],
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[0x5c, 0x73, 0x33, 0x6a, 0x76, 0xd8, 0xbf, 0x9a],
|
||
|
|
[0xd0, 0xa7, 0x04, 0x53, 0x6b, 0xa9, 0x3e, 0x0e],
|
||
|
|
[0x92, 0x59, 0x58, 0xfc, 0xd6, 0x42, 0x0c, 0xad],
|
||
|
|
[0xa9, 0x15, 0xc2, 0x9b, 0xc8, 0x06, 0x73, 0x18],
|
||
|
|
[0x95, 0x2b, 0x79, 0xf3, 0xbc, 0x0a, 0xa6, 0xd4],
|
||
|
|
[0xf2, 0x1d, 0xf2, 0xe4, 0x1d, 0x45, 0x35, 0xf9],
|
||
|
|
[0x87, 0x57, 0x75, 0x19, 0x04, 0x8f, 0x53, 0xa9],
|
||
|
|
[0x10, 0xa5, 0x6c, 0xf5, 0xdf, 0xcd, 0x9a, 0xdb],
|
||
|
|
[0xeb, 0x75, 0x09, 0x5c, 0xcd, 0x98, 0x6c, 0xd0],
|
||
|
|
[0x51, 0xa9, 0xcb, 0x9e, 0xcb, 0xa3, 0x12, 0xe6],
|
||
|
|
[0x96, 0xaf, 0xad, 0xfc, 0x2c, 0xe6, 0x66, 0xc7],
|
||
|
|
[0x72, 0xfe, 0x52, 0x97, 0x5a, 0x43, 0x64, 0xee],
|
||
|
|
[0x5a, 0x16, 0x45, 0xb2, 0x76, 0xd5, 0x92, 0xa1],
|
||
|
|
[0xb2, 0x74, 0xcb, 0x8e, 0xbf, 0x87, 0x87, 0x0a],
|
||
|
|
[0x6f, 0x9b, 0xb4, 0x20, 0x3d, 0xe7, 0xb3, 0x81],
|
||
|
|
[0xea, 0xec, 0xb2, 0xa3, 0x0b, 0x22, 0xa8, 0x7f],
|
||
|
|
[0x99, 0x24, 0xa4, 0x3c, 0xc1, 0x31, 0x57, 0x24],
|
||
|
|
[0xbd, 0x83, 0x8d, 0x3a, 0xaf, 0xbf, 0x8d, 0xb7],
|
||
|
|
[0x0b, 0x1a, 0x2a, 0x32, 0x65, 0xd5, 0x1a, 0xea],
|
||
|
|
[0x13, 0x50, 0x79, 0xa3, 0x23, 0x1c, 0xe6, 0x60],
|
||
|
|
[0x93, 0x2b, 0x28, 0x46, 0xe4, 0xd7, 0x06, 0x66],
|
||
|
|
[0xe1, 0x91, 0x5f, 0x5c, 0xb1, 0xec, 0xa4, 0x6c],
|
||
|
|
[0xf3, 0x25, 0x96, 0x5c, 0xa1, 0x6d, 0x62, 0x9f],
|
||
|
|
[0x57, 0x5f, 0xf2, 0x8e, 0x60, 0x38, 0x1b, 0xe5],
|
||
|
|
[0x72, 0x45, 0x06, 0xeb, 0x4c, 0x32, 0x8a, 0x95],
|
||
|
|
];
|
||
|
|
|
||
|
|
let k0 = 0x_07_06_05_04_03_02_01_00;
|
||
|
|
let k1 = 0x_0f_0e_0d_0c_0b_0a_09_08;
|
||
|
|
let mut vin = [0u8; 64];
|
||
|
|
let mut state_inc = HashEngine::with_keys(k0, k1);
|
||
|
|
|
||
|
|
for i in 0..64 {
|
||
|
|
vin[i] = i as u8;
|
||
|
|
let vec = Hash::from_slice(&vecs[i][..]).unwrap();
|
||
|
|
let out = Hash::hash_with_keys(k0, k1, &vin[0..i]);
|
||
|
|
assert_eq!(vec, out, "vec #{}", i);
|
||
|
|
|
||
|
|
let inc = Hash::from_engine(state_inc.clone());
|
||
|
|
assert_eq!(vec, inc, "vec #{}", i);
|
||
|
|
state_inc.input(&[i as u8]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[cfg(bench)]
|
||
|
|
mod benches {
|
||
|
|
use test::Bencher;
|
||
|
|
|
||
|
|
use crate::{Hash, HashEngine, siphash24};
|
||
|
|
|
||
|
|
#[bench]
|
||
|
|
pub fn siphash24_1ki(bh: &mut Bencher) {
|
||
|
|
let mut engine = siphash24::Hash::engine();
|
||
|
|
let bytes = [1u8; 1024];
|
||
|
|
bh.iter(|| {
|
||
|
|
engine.input(&bytes);
|
||
|
|
});
|
||
|
|
bh.bytes = bytes.len() as u64;
|
||
|
|
}
|
||
|
|
|
||
|
|
#[bench]
|
||
|
|
pub fn siphash24_64ki(bh: &mut Bencher) {
|
||
|
|
let mut engine = siphash24::Hash::engine();
|
||
|
|
let bytes = [1u8; 65536];
|
||
|
|
bh.iter(|| {
|
||
|
|
engine.input(&bytes);
|
||
|
|
});
|
||
|
|
bh.bytes = bytes.len() as u64;
|
||
|
|
}
|
||
|
|
|
||
|
|
#[bench]
|
||
|
|
pub fn siphash24_1ki_hash(bh: &mut Bencher) {
|
||
|
|
let k0 = 0x_07_06_05_04_03_02_01_00;
|
||
|
|
let k1 = 0x_0f_0e_0d_0c_0b_0a_09_08;
|
||
|
|
let bytes = [1u8; 1024];
|
||
|
|
bh.iter(|| {
|
||
|
|
let _ = siphash24::Hash::hash_with_keys(k0, k1, &bytes);
|
||
|
|
});
|
||
|
|
bh.bytes = bytes.len() as u64;
|
||
|
|
}
|
||
|
|
|
||
|
|
#[bench]
|
||
|
|
pub fn siphash24_1ki_hash_u64(bh: &mut Bencher) {
|
||
|
|
let k0 = 0x_07_06_05_04_03_02_01_00;
|
||
|
|
let k1 = 0x_0f_0e_0d_0c_0b_0a_09_08;
|
||
|
|
let bytes = [1u8; 1024];
|
||
|
|
bh.iter(|| {
|
||
|
|
let _ = siphash24::Hash::hash_to_u64_with_keys(k0, k1, &bytes);
|
||
|
|
});
|
||
|
|
bh.bytes = bytes.len() as u64;
|
||
|
|
}
|
||
|
|
}
|